Math IV Matrices Test

What is a square matrix?

• A matrix that has the same amount of rows and columns

• A matrix with no rows

• A matrix with no columns

• A matrix with 6 rows

In the matrix shown, what element is

 $a_{23}$  ?

• 3

• 6

• 2

• 4

When can matrices be added or subtracted?

• Only if they are square matrices

• They can never be added or subtracted

• They can anytime

• They must have the same dimensions

Tags

CCSS.HSN.VM.C.8

Is the sum defined?

• Yes, matrices can always be added

• No, because the matrices do not have the same dimensions

• No, because you cannot add positive and negative numbers

• Yes, the answer is 3

Tags

CCSS.HSN.VM.C.8

If Matrix A has dimensions 3x7 and Matrix B has dimensions 7x8, then what are the dimensions of Matrix AB?

• 7x7

• 3x7

• 3x8

• 7x8

Tags

CCSS.HSN.VM.C.8

Dimensions?

• 1x4

• 2x2

• 4x1

• 3x1

• 10

• -7

• 7

• -10

You can multiply a 2X3 matrix by which matrix?

• 2X2
• 2X12
• 3X12
• 2X3

Tags

CCSS.HSN.VM.C.8

Find the determinant of the following matrix.

• 129

• -129

• 81

• -81

These matrices are being multiplied. Determine the dimension of the new matrix.

• can't be multiplied

• 4 x 2

• 3 x 3

• 4 x 3

Tags

CCSS.HSN.VM.C.8